Astero is the best as you can both do exploration effectively and kill other explorers and generally other ships in it. Frigates are toast, destroyers too if you can keep range, sometimes even cruisers, mining barges and more… Astero the king of exploration frigates!

Magnate. Those four low slots packed with stabs are guaranteed to piss off most wormhole Astero lurkers. If you lose it, it’s just a few million isk which can be re-made several times over in the next site.